Leap 42.3 - KDE Be Free - Getting update error "A security trust relationship is not present...

Hello:
Can you please let me now how to fix the Update Error ?

Couple of weeks back, I installed Leap 42.3 on KDE Be Free and all my applications are working fine. Only thing, I just noticed since last week that after I start my laptop the software upgrade is giving error hence there is no updates are downloaded.

I am getting the following update error:
**“A security trust relationship is not present A security trust relationship could not be made with the software origin. Please check your software signature settings”
**
My system is:


abcd@linux-hcxx~> cat /etc/os-release
NAME="openSUSE Leap"
VERSION="42.3"
ID=opensuse
ID_LIKE="suse"
VERSION_ID="42.3"
PRETTY_NAME="openSUSE Leap 42.3"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:leap:42.3"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"

I have no idea what KDE Be Free is but it sound like a repository pgp key issue
tell us your repo list

zypper lr -d